Rear end ? Limited Slip or ?

 
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Old 07-11-2019, 02:49 PM
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Rear end ? Limited Slip or ?

Ok, what I thought was sound of the tread blocks is bad. Sounds like it is engaged in 4x4 on dry pavement ,from the rear..aggressive tire sounds are like bearings...
Local guy took it for a spin finally after I had concerns about rattle in front end suspension. He did not notice that but did notice rear end bearing sound...not good. His guys did the fluid switch @ 89k....aks me if it is limited slip differential...
I just assumed it was limited slip differential ..2001 F-150 Lariat 4x4 Offroad....... & I assumed they put the proper fluids in. Sound is very bad from RR & vibrates wheel flairs....not good.

I am taking it to a guy who has shop in Alb. to check & probably trailer to town.I am very nervous about seized LS or rear end bearing now. I will have him drive & listen to frontend rattle & rearend.
I also know local shade tree is not a good idea in long run. Tough being in middle of nowhere in NM...on terrible roads.
Guess's on if it LS or what problem is?
 
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Old 07-11-2019, 03:20 PM
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What is the axle code on the door jam sticker? Also there should be 2 tags on the rear diff cover that tells you the gear ratio and whethe it has traction lock.
 
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Old 07-11-2019, 03:54 PM
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door code H9

tags are use 140W Sythn only &
S 919 F
L 55 9 75 1B13
 
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Old 07-11-2019, 05:16 PM
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Yes, that's a 3.55 LS 9.75" axle. 75W140 synthetic plus a bottle of Ford XL3 friction modifier.
 
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Old 07-11-2019, 05:49 PM
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Thank you glc.
I sent pics of tag to guy who will be working on it. He suspects that no additive was added.He uses Ford. He is going to order parts after he looks at it Sat.
I will show him this & the Forum. I cannot believe how many mech's do not know about this page & similar ones,but can play solitaire...lol.
This guy does go by book & has great shop & staff & checked truck when I was buying. I was going to work on my old Tacoma,but it will have to be daily driver again for a while.
Thanks again for info.
 
 


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